1242355 has 8 divisors (see below), whose sum is σ = 1498464. Its totient is φ = 988800.

The previous prime is 1242347. The next prime is 1242359. The reversal of 1242355 is 5532421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1242355 - 2³ = 1242347 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (187308).

2^1242355 is an apocalyptic number.

1242355 is a deficient number, since it is larger than the sum of its proper divisors (256109).

1242355 is a wasteful number, since it uses less digits than its factorization.

1242355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277.

The product of its digits is 1200, while the sum is 22.

The square root of 1242355 is about 1114.6097971936. The cubic root of 1242355 is about 107.5016765558.

Adding to 1242355 its reverse (5532421), we get a palindrome (6774776).

The spelling of 1242355 in words is "one million, two hundred forty-two thousand, three hundred fifty-five".